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   * Copyright 2010-2015, Inc. or its affiliates. All Rights Reserved.
   * Licensed under the Apache License, Version 2.0 (the "License").
   * You may not use this file except in compliance with the License.
   * A copy of the License is located at
  * or in the "license" file accompanying this file. This file is distributed
  * express or implied. See the License for the specific language governing
  * permissions and limitations under the License.
 package com.amazonaws.http;
 import java.util.Map;
Default implementation of HttpResponseHandler that handles a successful response from an AWS service and unmarshalls the result using a JSON unmarshaller.

<T> Indicates the type being unmarshalled by this response handler.
 public class JsonResponseHandler<T> implements HttpResponseHandler<AmazonWebServiceResponse<T>> {

The JSON unmarshaller to use when handling the response
Shared logger for profiling information
     private static final Log log = LogFactory.getLog("com.amazonaws.request");
     private static JsonFactory jsonFactory = new JsonFactory();
     public boolean needsConnectionLeftOpen = false;

Constructs a new response handler that will use the specified JSON unmarshaller to unmarshall the service response and uses the specified response element path to find the root of the business data in the service's response.

responseUnmarshaller The JSON unmarshaller to use on the response.
     public JsonResponseHandler(Unmarshaller<T, JsonUnmarshallerContextresponseUnmarshaller) {
         this. = responseUnmarshaller;
          * Even if the invoked operation just returns null, we still need an
          * unmarshaller to run so we can pull out response metadata.
          * We might want to pass this in through the client class so that we
          * don't have to do this check here.
         if (this. == null) {
             this. = new VoidJsonUnmarshaller<T>();

     public AmazonWebServiceResponse<T> handle(HttpResponse responsethrows Exception {
         .trace("Parsing service response JSON");
         String CRC32Checksum = response.getHeaders().get("x-amz-crc32");
         CRC32ChecksumCalculatingInputStream crc32ChecksumInputStream = null;
         JsonParser jsonParser = null;
         if (!) {
             if (CRC32Checksum != null) {
                 crc32ChecksumInputStream = new CRC32ChecksumCalculatingInputStream(response.getContent());
                 jsonParser = .createParser(crc32ChecksumInputStream);
             } else {
                 jsonParser = .createParser(response.getContent());
        try {
            AmazonWebServiceResponse<T> awsResponse = new AmazonWebServiceResponse<T>();
            JsonUnmarshallerContext unmarshallerContext = new JsonUnmarshallerContextImpl(
            T result = .unmarshall(unmarshallerContext);
            if (CRC32Checksum != null) {
                long serverSideCRC = Long.parseLong(CRC32Checksum);
                long clientSideCRC = crc32ChecksumInputStream.getCRC32Checksum();
                if (clientSideCRC != serverSideCRC) {
                    throw new CRC32MismatchException("Client calculated crc32 checksum didn't match that calculated by server side");
            Map<StringStringmetadata = unmarshallerContext.getMetadata();
            awsResponse.setResponseMetadata(new ResponseMetadata(metadata));
            .trace("Done parsing service response");
            return awsResponse;
        } finally {
            if (!) {
                try {
                } catch (IOException e) {
                    .warn("Error closing json parser"e);

Hook for subclasses to override in order to collect additional metadata from service responses.

unmarshallerContext The unmarshaller context used to process a service's response data.
    protected void registerAdditionalMetadataExpressions(JsonUnmarshallerContext unmarshallerContext) {}

Since this response handler completely consumes all the data from the underlying HTTP connection during the handle method, we don't need to keep the HTTP connection open.

    public boolean needsConnectionLeftOpen() {
        return ;
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